libtsxx [FIX]: set correct value of output samples

src/libs/libtsxx/ipo.cc

@@ -108,6 +108,7 @@ namespace ts {
                   ExceptionTimeWindowOutside);
       Ttimeseries retval=Ttimeseries(Tseries(nsamples), hd);
       retval.header.date=new_first;
+      retval.header.nsamples=nsamples;
       retval.header.dt=libtime::time2double(dt);
       TAbsoluteTime it=new_first;
       for (int i=0; i<nsamples; ++i) { retval(i)=ip(it); it += dt; }